body{
	width: 800px;
	margin:20px auto;
}
div{
	position: relative;
}
ul li{
	color: white;
	text-align: center;
	display: inline-block;
}
.yuanjiao{
	width: 20px;
	height: 20px;
	border-radius: 15px;
	background-color: #A9A9A9;
}
#f1{
	position:absolute;
	left: 290px;
	top: 410px;
}
li:hover{
	background-color: red;
}
